[PATCH] strmbase: Remove code duplicated by every user of ISeekingPassThruImpl

[Alessandro Pignotti]

It seems that every object which internally uses TranformFilter also
independently instantiate a ISeekingPassThru and does not release it at
the end of the life cycle. This patch fixes the problem by moving the
usage of ISeekpingPassThru into TransformFilter and removing all the
duplicated code.
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